westonpace commented on code in PR #34651:
URL: https://github.com/apache/arrow/pull/34651#discussion_r1198947322
##########
cpp/src/arrow/engine/substrait/relation_internal.cc:
##########
@@ -367,6 +367,23 @@ ARROW_ENGINE_EXPORT Result<DeclarationInfo>
MakeAggregateDeclaration(
} // namespace internal
+namespace {
+
+bool IsSortNullsFirst(const substrait::SortField::SortDirection& direction) {
+ return direction % 2 == 1;
+}
+
+compute::SortOrder SortOrderFromDirection(
+ const substrait::SortField::SortDirection& direction) {
+ if (direction < 3) {
+ return compute::SortOrder::Ascending;
Review Comment:
This is now an explicit rejection.
```
case substrait::SortField::SortDirection::
SortField_SortDirection_SORT_DIRECTION_UNSPECIFIED:
return Status::Invalid("The substrait plan does not specify a sort
direction");
```
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